DNJ
DNJ 2003 Ford Ranger 4.0L Crankshaft Seal
DNJ 2003 Ford Ranger 4.0L Crankshaft Seal
Part number: RM422_75
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- Free fitment check before you order
Listed for: Ford Ranger 4.0LFitment notes & questions
Crankshaft Seal by DNJ, made to fit the 2003 Ford Ranger with the 4.0L engine as listed below. Rubber seals age and harden over time, so older engines often need them when other work is done nearby. Part number: RM422_75.
Key features
- Made for VIN T 12V OHV engines
- Listed for V6 2.9L, 4.0L 177, 245 OHV, SOHC 12V engines
Specifications
- Brand: DNJ
- Part type: Seal
- Part number: RM422_75
- Engine: 4.0L
- Engine code: VIN T 12V OHV
Fitment for the 2003 Ford Ranger
- Years: 1986–2011
- Vehicles: Ford, Land Rover, Mazda
- Cylinders: V6
- Displacement: 2.9L, 4.0L
- Engine: 177, 245 OHV, SOHC 12V
Check your year, model, engine and trim against this list before you order.
What it does
A worn seal lets oil seep out or get burned. Replacing it is cheap; getting to it is usually the work. Using the correct part for your exact engine keeps oil pressure, sealing and timing where the engine was designed to run, and doing related parts at the same time saves taking it apart twice.
Installation & tips
- Lightly oil the seal lip before installation and press it in square so it does not cock or fold.
- Timing parts: Front crank and cam seals sit behind the timing belt or chain, so they are often done together.
- Put the new part next to the old one and compare the shape, mounting points and connections before you install it.
- Work on a cool engine with the vehicle secured, and use a service manual for your vehicle for torque specs and procedures.
FAQ
What is the part number of this crankshaft seal?
RM422_75 (DNJ). Compare it with the number on your old part or in your parts catalog.
Which engine is it for?
It is listed for the 4.0L VIN T 12V OHV engine in the 2003 Ford Ranger. Check the engine code on your vehicle if it was offered with more than one engine.
Can I install it myself?
Many owners do this job at home with basic tools and a service manual for their vehicle. If you are not sure, have it fitted by a qualified mechanic.
Before you order
- Confirm your year, make, model, engine and trim match the fitment listed above (2003 Ford Ranger 4.0L).
- Compare part number RM422_75 with your original part.
Good to know
- Warranty: 12 month or 12,000 mile warranty whichever comes first. Warranty must be requested by the original purchaser and is limited to the replacement of the alleged defective part(s) only.

Before you order: Ford Ranger 4.0L seal fitment
Seals keep oil in where a shaft passes through a housing, such as the crankshaft or camshaft ends.
Fitment notes
- Listed for: Ford Ranger 4.0L.
- Engine: check the engine size listed against your vehicle's VIN or under-hood label.
- Specs, lead time and warranty come from DNJ and can change. The details above this guide are the latest we have.
Not sure it fits? Message us your vehicle details and we'll double-check fitment before you buy.
Ask about fitmentPlan the whole job
- Timing parts. Front crank and cam seals sit behind the timing belt or chain, so they are often done together.
More for your car: Ford Crankshaft Seals · Ford Parts · All Crankshaft Seals · Engine
Questions about Ford Ranger 4.0L seal
Will this fit my Ford Ranger 4.0L?
How do I know a seal is leaking?
Where do specs and warranty details come from?
Questions & answers
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